Improvement in wrenches



@sind States @anni djjw.

. GEORGE C. TAFT, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO LORING GOES,OF SAME PLACE.

Letters Patent No. 89,702, dated Ma/y 4,1869.

Know all men by these presents:

That I, GEORGE O. TAFT, of the city and county of Worcester, and Commonwealth of Massachusetts, have invented certain new andusefulImprovements in Screw- Wrenches, of which the following is a full,clear, and exact description, reference being had to the accompanyling1drawings, forming a part of this specification, in w 1c Figure 1represents a side view of a screw-wrench,A with my improvements appliedthereto, the rear end of the handle being shoum broken away, and

Figure 2 represents a section on line A B, fig. l.

To-enable those skilled in the art to which my invention belongs, tomake and use the same, I will describe it more in detail. l

The nature of my invention consists- First, in the combination with theshankand ferrule of a wrench, of a divided quill, as and for thepurposes hereafter explained.

Second, in the combination with the rear projecting-end of therosette-screw, of a set or stop-nut, as and for the purposes explained.

In the drawing- A is the ferrle, which is supported against the backstrain of the rosette-screw B, when the wrench is used, by means of adivided quill, G, arranged upon the shank D, and overwhich the handle Eis slipped, before the rear nut F is screwed upon the end of shank D.

In a previous invention for which I applied for Letters Patent, alwholequill, O, was used for a similar purpose, but practical objections arefound to exist to the use of a whole quill, for the reason, that if the.vshank D is not always of the same size, quill O is liable to eitherbind, when itis slipped on, or else it goes on with a too loose iit. Y

These objections are obviated by the use of a divided qull, as shown inthe drawings, since they can be made in sections less than half the sizeof shank D, and consequently will t shanks of an under-size, as well asshanks of over-size.

In making the sections of the quill, I prefer to make the end next tothe vferrule the largest, and tapering towards the rear end, to conformto the ordinary shape of the shank.

When nut Fis screwed up, it forces the forward ends of the sections ofthe quill against the inner shoulders of the ferrule, as indicated indotted lines, whereby the back strain on the ferrule, which issustained, in the ordinary Goes wrench, by the handle E, is transferreddirection, thus changing the desired opening H, be- Y tween the movablejaw G and stationary jaw I.

' To overcome and guard against such occurrences, the rear end of therosette-screw B is made so as to project back of the rosette J, andthrough projection K of ferrule A, a suflicient distance to receive acheck or stop-nut L, which is provided with a screw-thread,

to fit a screw-thread cut on the projecting end a of therosette-screwspindle B.

The operation is as follows: Y

When the wrench is to be used -in the ordinary manner, nut L is turnedback, and the rosette-screw B can be turned freely in either direction;out when the wrench is to be used on a uniform-sizedA nut, the movablejaw'G is adjusted by means of rosette J and screw B, after which stop orcheck-nut L is turned up, thereby drawing rosette J back against theprojection K of ferrule A, and locking-screw B, in a fixed position.

It may be well to upset theprojection a slightly,

after nutl L has been screwed on, for the purpose of preventing theaccidentaldisplacement and loss of said nut.

Having described my improvements in screwwrenches,

What I claim therein as new, and of my invention,

land desire to secure by Letters Patent, is-

1. The combination, with the shank D, ferrule A, and nut F of a wrench,of one or more sections of a supporting-quill, substantially as and forthe purposes.

set forth;

2. A stop or check-nut L, substantially as and for thepurposes setforth.

3. The combination, with the ferrule A, shank D, and rosette-screwspindle B, of a divided quill, O, and stop-nut L, substantially as andfor the purposes set forth.

GEO. 4O. TAFT.

Witnesses:

THos. H. DODGE, GRAS. H. BURLEIGH.

